Block and Tackle window balance

A home owner from Murrieta, CA says:
Marking is 2630 BS MK. The channel length is 27". Channel width is 1/2" (9/16). Channel depth is 5/8". Both top and bottom guildes are winged.
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Emily from SWISCO responded:

Hello!

With this combination of attachments, you could have either an S380-27 or S385-27 channel balance. You’ll need to measure as shown below. The Series 380 has a 1" bottom attachment, and the Series 385 has a 1-3/32" attachment. You will also need the 2630 spring strength option.

Let me know if you have any questions!

Comparison of the S380 and S385 balance shoes.
Comparison of the S380 and S385 balance shoes.
A home owner from Murrieta, CA says:
Thanks! I ordered two S380 with 2630 option. Hope they will fit well.
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